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Summary of Stock Option Activity (Detail) - $ / shares
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Stock-Based Compensation And Incentive Plans [Abstract]      
Weighted-average Exercise Price Beginning Balance Outstanding $ 31.73 $ 41.69 $ 47.51
Weighted-average Exercise Price, Granted   7.21 22.80
Weighted-average Exercise Price, Exercised     35.21
Weighted-average Exercise Price, Expired or cancelled/forfeited 44.86 52.67 42.97
Weighted-average Exercise Price, Ending Balance Outstanding $ 28.14 $ 31.73 $ 41.69
Number of Shares Outstanding      
Number of Shares Beginning Balance Outstanding 1,777,124 1,709,206 1,370,056
Number of Shares, Granted   405,817 428,326
Number of Shares, Exercised     (29,118)
Number of Shares, Expired or cancelled/forfeited (381,576) (337,899) (60,058)
Number of Shares Ending Balance Outstanding 1,395,548 1,777,124 1,709,206